Foreign Languages Pub. House, 1959
Buku Teks
Dean, Vera Micheles, author
Harvard University Press, 1948
Buku Teks
Petrov, Vladimir, author
American Institute fo Public Research, 1975
Buku Teks
edited by William E. Griffith
Lexington Books, 1976
Buku Teks
Moorad, George
E.P. Duttom, 1949
Buku Teks